Diff: Printit.cpp

Revision:

0:5ca227682ee7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Printit.cpp	Tue May 31 15:32:03 2016 +0000
@@ -0,0 +1,271 @@
+/*
+ Print.cpp - Base class that provides print() and println()
+ Copyright (c) 2008 David A. Mellis.  All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+ Modified 23 November 2006 by David A. Mellis
+ Modified 03 August 2015 by Chuck Todd
+ */
+
+//#include <stdlib.h>
+//#include <stdio.h>
+//#include <string.h>
+#include <math.h>
+//#include "Arduino.h"
+
+#include "Printit.h"
+
+// Public Methods //////////////////////////////////////////////////////////////
+
+/* default implementation: may be overridden */
+size_t Print::write(const uint8_t *buffer, size_t size)
+{
+    size_t n = 0;
+    while (size--) {
+        if (write(*buffer++)) n++;
+        else break;
+    }
+    return n;
+}
+
+#if 0
+size_t Print::print(const __FlashStringHelper *ifsh)
+{
+    PGM_P p = reinterpret_cast<PGM_P>(ifsh);
+    size_t n = 0;
+    while (1) {
+        unsigned char c = pgm_read_byte(p++);
+        if (c == 0) break;
+        if (write(c)) n++;
+        else break;
+    }
+    return n;
+}
+
+size_t Print::print(const String &s)
+{
+    return write(s.c_str(), s.length());
+}
+#endif
+
+size_t Print::print(char *str)
+{
+    return write(str);
+}
+
+size_t Print::print(char c)
+{
+    return write(c);
+}
+
+size_t Print::print(unsigned char b, int base)
+{
+    return print((unsigned long) b, base);
+}
+
+size_t Print::print(int n, int base)
+{
+    return print((long) n, base);
+}
+
+size_t Print::print(unsigned int n, int base)
+{
+    return print((unsigned long) n, base);
+}
+
+size_t Print::print(long n, int base)
+{
+    if (base == 0) {
+        return write(n);
+    } else if (base == 10) {
+        if (n < 0) {
+            int t = print('-');
+            n = -n;
+            return printNumber(n, 10) + t;
+        }
+        return printNumber(n, 10);
+    } else {
+        return printNumber(n, base);
+    }
+}
+
+size_t Print::print(unsigned long n, int base)
+{
+    if (base == 0) return write(n);
+    else return printNumber(n, base);
+}
+
+size_t Print::print(double n, int digits)
+{
+    return printFloat(n, digits);
+}
+
+#if 0
+size_t Print::println(const __FlashStringHelper *ifsh)
+{
+    size_t n = print(ifsh);
+    n += println();
+    return n;
+}
+#endif
+
+size_t Print::print(const Printable& x)
+{
+    return x.printTo(*this);
+}
+
+size_t Print::println(void)
+{
+    return write("\r\n");
+}
+
+#if 0
+size_t Print::println(const String &s)
+{
+    size_t n = print(s);
+    n += println();
+    return n;
+}
+#endif
+
+size_t Print::println(char *c)
+{
+    size_t n = print(c);
+    n += println();
+    return n;
+}
+
+size_t Print::println(char c)
+{
+    size_t n = print(c);
+    n += println();
+    return n;
+}
+
+size_t Print::println(unsigned char b, int base)
+{
+    size_t n = print(b, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(int num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(unsigned int num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(long num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(unsigned long num, int base)
+{
+    size_t n = print(num, base);
+    n += println();
+    return n;
+}
+
+size_t Print::println(double num, int digits)
+{
+    size_t n = print(num, digits);
+    n += println();
+    return n;
+}
+
+size_t Print::println(const Printable& x)
+{
+    size_t n = print(x);
+    n += println();
+    return n;
+}
+
+// Private Methods /////////////////////////////////////////////////////////////
+
+size_t Print::printNumber(unsigned long n, uint8_t base)
+{
+    char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
+    char *str = &buf[sizeof(buf) - 1];
+
+    *str = '\0';
+
+    // prevent crash if called with base == 1
+    if (base < 2) base = 10;
+
+    do {
+        char c = n % base;
+        n /= base;
+
+        *--str = c < 10 ? c + '0' : c + 'A' - 10;
+    } while(n);
+
+    return write(str);
+}
+
+size_t Print::printFloat(double number, uint8_t digits)
+{
+    size_t n = 0;
+
+    if (isnan(number)) return print("nan");
+    if (isinf(number)) return print("inf");
+    if (number > 4294967040.0) return print ("ovf");  // constant determined empirically
+    if (number <-4294967040.0) return print ("ovf");  // constant determined empirically
+
+    // Handle negative numbers
+    if (number < 0.0) {
+        n += print('-');
+        number = -number;
+    }
+
+    // Round correctly so that print(1.999, 2) prints as "2.00"
+    double rounding = 0.5;
+    for (uint8_t i=0; i<digits; ++i)
+        rounding /= 10.0;
+
+    number += rounding;
+
+    // Extract the integer part of the number and print it
+    unsigned long int_part = (unsigned long)number;
+    double remainder = number - (double)int_part;
+    n += print(int_part);
+
+    // Print the decimal point, but only if there are digits beyond
+    if (digits > 0) {
+        n += print(".");
+    }
+
+    // Extract digits from the remainder one at a time
+    while (digits-- > 0) {
+        remainder *= 10.0;
+        int toPrint = int(remainder);
+        n += print(toPrint);
+        remainder -= toPrint;
+    }
+
+    return n;
+}
+